Is there different types of testosterones that will cause a rapid heartbeat a few hours after injection more than others? how can this be prevented?

Not to my understand: While people react differently to different medications, there's no way of knowing in advance which testosterone will cause what side effect. All the hormone preparations list tachycardia or fast heart rate as a side effect. There's no specific way to mitigate these side effects but generic cardiac meds can be used. Talk to your prescriber or use HealthTap Prime to discuss your individual case.